// readerToFile copies the reader to a temp file and returns its name or error
func readerToFile(r io.Reader, prefix string) (filename string, err error) {
dfh, e := ioutil.TempFile("", "agostle-"+baseName(prefix)+"-")
if e != nil {
err = e
return
}
if sfh, ok := r.(*os.File); ok {
filename = dfh.Name()
_ = dfh.Close()
_ = os.Remove(filename)
err = temp.LinkOrCopy(sfh.Name(), filename)
return
}
if _, err = io.Copy(dfh, r); err == nil {
filename = dfh.Name()
}
_ = dfh.Close()
return
}
// PdfMerge merges pdf files into destfn
func PdfMerge(ctx context.Context, destfn string, filenames ...string) error {
if len(filenames) == 0 {
return fmt.Errorf("filenames required!")
} else if len(filenames) == 1 {
return temp.LinkOrCopy(filenames[0], destfn)
}
var cmd *exec.Cmd
args := append(make([]string, 0, len(filenames)+3), filenames...)
pdfunite := popplerOk["pdfunite"]
if pdfunite != "" {
args = append(args, destfn)
cmd = exec.Command(pdfunite, args...)
} else {
args = append(append(append(args, "cat"), "output"), destfn)
cmd = exec.Command(*ConfPdftk, args...)
}
logger.Debug("msg", "PdfMerge calling", "command", fmt.Sprintf("%s", cmd.Args))
return runWithContext(ctx, cmd)
}